modify params transfer mode in test_snapshot_manage

In test_snapshot_manage, when use list_snapshot, the params is wrong
used.

Change-Id: I7567b0aa15cab851ea15da56b214cbdddcfdada1
Closes-bug: #1740811
diff --git a/tempest/api/volume/admin/test_snapshot_manage.py b/tempest/api/volume/admin/test_snapshot_manage.py
index 3b21b28..37a47ec 100644
--- a/tempest/api/volume/admin/test_snapshot_manage.py
+++ b/tempest/api/volume/admin/test_snapshot_manage.py
@@ -63,7 +63,7 @@
         # Verify the original snapshot does not exist in snapshot list
         params = {'all_tenants': 1}
         all_snapshots = self.admin_snapshots_client.list_snapshots(
-            detail=True, params=params)['snapshots']
+            detail=True, **params)['snapshots']
         self.assertNotIn(snapshot['id'], [v['id'] for v in all_snapshots])
 
         # Manage the snapshot